The
openpam_nullconv()
function is a null conversation function suitable
for applications that want to use PAM but don't support interactive
dialog with the user.
Such applications should set
PAM_AUTHTOK
to whatever authentication
token they've obtained on their own before calling
pam_authenticate(3)
and / or
pam_chauthtok(3),
and their PAM configuration should specify the
use_first_pass
option for all modules that require access to the
authentication token, to make sure they use
PAM_AUTHTOK
rather than
try to query the user.
